W E Wightman, "The Lacy Family in England and Normandy, 1066-1194", genealogical chart following p 260. (pp. 175, 177-178): "Eustace fitz John, Payn's eldest brother, married Beatrice, the Vesci heiress, and thus inherited through her the honours of Alnwick and Malton. Their son assumed the surname Vesci, it being this William whose sister probably married Henry I de Lacy of Pontefract. By his second marriage Eustace had a son Robert. He in his turn married Aubrey de Lisours, daughter of Aubrey the sister of Ilbert II de Lacy, through whom the Pontefract honour descended in 1194 to Roger de Lacy, grandson of Robert fitz Eustace."